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Fair Value of Financial Instruments - Summary of financial instruments (Details) - USD ($) $ in Thousands | Apr. 04, 2020 | Dec. 28, 2019
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Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | $ 442,493 | $ 498,825
Recurring |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 173,483 | 93,704
Total short-term investments | 442,493 | 498,825
Other assets, net | 5,400 | 5,647
Total assets at fair value | 621,376 | 598,176
Recurring | Money market funds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 167,636 | 92,379
Recurring | Corporate debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 5,847 | 1,325
Total short-term investments | 304,122 | 326,954
Recurring | Government debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | 138,371 | 171,871
Recurring | Auction rate securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Other assets, net | 5,400 | 5,647
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 167,636 | 92,379
Total short-term investments | 85,519 | 85,189
Total assets at fair value | 253,155 | 177,568
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 167,636 | 92,379
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Government debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | 85,519 | 85,189
Recurring | Significant Other Observable Inputs (Level 2) |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 5,847 | 1,325
Total short-term investments | 356,974 | 413,636
Total assets at fair value | 362,821 | 414,961
Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 5,847 | 1,325
Total short-term investments | 304,122 | 326,954
Recurring | Significant Other Observable Inputs (Level 2) | Government debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | 52,852 | 86,682
Recurring | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Other assets, net | 5,400 | 5,647
Total assets at fair value | 5,400 | 5,647
Recurring | Significant Unobservable Inputs (Level 3) | Auction rate securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Other assets, net | $ 5,400 | $ 5,647

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